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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00508afa4c1f3f068a8f4f01d81cd5eac617413a2fda3b6eadcce6314c22fb9' 
  AND token = 'LlfvT+fY7aehVTwAo/rd/TxWymDVHHouXOw8+9dFRxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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