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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a99dc9b4305ae2b563cbaa916233ca0f3349bbcff1ec73d4ae6b114bc2c4a68' 
  AND token = 'ZOryl1Ll7jRLbNjNUkZHUO2d2VxaiQHjpZxTJc1KwlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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