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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e144ed89ce5e575a3546696eb38d0801997b7b04de80530a7cae056dba8194' 
  AND token = 'l6lh0N1TuImUZQQv30mu8kQoHwx7Jq8Z4URppJah0I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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