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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b691c5fd39aef2c3777c75f84bfc829490082b2e1615e71a9c04fb12364ba9' 
  AND token = 'iPpDbnYSsKoi8INUTvZ7Vfl07jqIKrZIa/Zx7Lnf74g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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