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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00193b97d21f612b035b9c820773ebf81ae3380e5e1e174c14f88c5c30f50d4d' 
  AND token = '9PGaJZO6vNw5w3c4zd7w1Ikv8RdJDAC4US1GwN7IDpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}