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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b572259eeba700184f79d4fda5d84f4adf57232365bd76a992d173633b9da76' 
  AND token = '1kfwH6E7lEoJ96InFp6q+23aKk5igsWEcaFNuo6rI34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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