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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '845f903237f1eff1b1c8b8f440338aa3bb206624fb374cef94215d9c6c175761' 
  AND token = '8ZDIkLn4LZ3X6BOl3AGOYS/BE3FcJk8yZQyzEMSytVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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