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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb5ce9df86c0ace6d801141fb0948e676fea9eddab964096cee459671441566' 
  AND token = 'uYcguC7wwZDb0v1ToG8Go1Xdjhdffx2A1/7MfXMqtVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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