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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf18d92d6cbe17fdbb1321909c5754acd98969e6c379f1e76f76c80bc573d8d' 
  AND token = 'Aw8ctIZP0tIDXum2V+N92R7eL8gZCPKWa1Tsdo4qxUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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