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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2995961b02c98a9e326738ccf81d091a7acf20ab1139ba3056925335cfdfaee3' 
  AND token = 'q9jxPDS10O6sA6uZ5jQ6zx6TbiC6+S5WUMOz2aZmR7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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