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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91847bed1430e2ff8a8ef59f26b13190c4ea3501e404c2eb84749a5b8e8026bd' 
  AND token = 'ZOqf1H6g3IN+YN4mlsVdNLutVNu4dqwA7mfH2TawI6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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