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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40941740a2b7b6547e4a569c05e0107cdeaa9616863341062dd57580b387afbc' 
  AND token = 'tgEbsF9K8FjDz5G1RpruiesR+r9MnJ/mqq2b2gRJAPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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