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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35481be6d42f741bb19a8343e97df8aa3389133fd853ac3d48ea5c076af94d8e' 
  AND token = 'zl4Zoeq32UzDHv3WEupv7QYSUZAfUDzpjXWGhHq8pek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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