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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe8f5e4669d1e249a86afee6d256261e8c924c8d9fd2096ce1bb68ae8480990' 
  AND token = 'i8C5WoX3VFenwO1oJJ6xG4jfPuC4RqvEAepa8901zFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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