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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da8a9a44203cd729c41e6b821e087fe4d6e24a25c0abfd2b08c6c98fcc30416' 
  AND token = 'yXxd4bfhm9sw5tkXIFBjyQFgduJbz3Z/ajUSCY92rx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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