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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a00d875c0f17d017c54d9e9858700e7f9f0fa76a3803592eec2ce5a397f17a' 
  AND token = 'zYefGIZ/egetbTBhWb+OVmdGE4b8GisvhCaBnqegMqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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