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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42224d475016b4dabd6b55a63dba11431c461c99e725f211eca9d1430a2e81f' 
  AND token = '6xY1yj8zP5knS5yvSbJaCwmj66oihxULQH7fz9UvCQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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