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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc07003e764078603fe800c824f7c56f2fabc79b963cc570d30a4455e71e09ae' 
  AND token = 'Ov0BMzrcCDP8q+U1sjPr/VJBc52u7hAEn02mGLuj+Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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