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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d5659fe54c6c13ecd1c8038aabf2636020040f764227bc1f13ec7bc56535f1' 
  AND token = 'Gf9iRKxPDBO0cT3kYhfRw78qAnOELyL+R44g1XKhfm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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