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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d00c436b03e68037a5c36236093ee64fb8bec2f87fd581fc521a3d8270d9c3' 
  AND token = 'qqeeAWm3/fkgyTW7/lJlD1V4GCP4exa/G/Yeh+UbNfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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