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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd312df6fc2740ecc1990e05dda057b053d9deb518c2510ea5d806f94c8e66e' 
  AND token = 'KEvViLj1kR9UAk0h1t1Piwjt+8xgMBoTrNnNCxEQF/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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