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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc62645f8245a431f45c0e5030e4e44a3adb5c2951a2ea765863b0b3d0967b71' 
  AND token = 'aFQWUEosE/X6oX/bADv9A9C37kDoN8+SuoiVVOteDl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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