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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1665a2576c38cd4d46c2e0bf8e21e53d73e26d0c61ca1ede470a864cdc412e' 
  AND token = '2G8jHRy6D4YEEWk8m/jUoGiTav9tsoQYxUn52bjWObE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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