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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea870226db1dff37ddbb9ca8cbf25bbb06bbd4d5ee7db22a61aca01df4087a16' 
  AND token = 'L8l8i4mLFoB0C9RlN+Z41CCp86CwNoPJ/hGyKF++EHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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