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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3297e31f330cb33f7aafffe6a8b2e89065b7d4d61e5fa4aed8e2e9cbadf09195' 
  AND token = 'wBY40YBEdWfuvWWuBN2iJ82h0m/smR/4fpOoVlUnp/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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