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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab56e8e6cfaf624c4ef9a18a7009153ef79a281850617c3e49f399e0d8729013' 
  AND token = 'Ls7KqWKjBEAz072r+jcFeFkRloGQdVX7pj1FHjspd+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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