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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02152734b39a8486067cf4913b8b1a706a89d03fea0bbba6a5ed9c1a079846c9' 
  AND token = 'gFVHbcm3hZsyzrE6k3fMHCnBDHN5tfh2EpFaE/9qkFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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