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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6117fb92a494ae78b085b620dc3ee6a44da194dc63fe42928fe83f06c02582e0' 
  AND token = '4tLy7iOboe3sMYwFY09SjkyA80UYob4NFJcpI6LiKro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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