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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2900a5e325ee05c74ddc81e358d61421d51e626eecb44ed871595e3d5050364' 
  AND token = 'kp2Mr1JCPTLA32fOcqfZTLSf6+7NSbkI2Hqjl3umeWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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