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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9dc4703fad8444de75b3cc746f0d0d0a3690de573d31782d3b977f5efa9fb3' 
  AND token = '79V6O93b1EiCwAtjt9C1PCxfxgSM+xpzFLZvvaX2n30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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