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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baeaa57a433723404ddafdf816fc735052ad21545247fd5df1efa95e4bd1e455' 
  AND token = 'XIX9CzPmWlS/b7lYHXlMJNUsw4U8y45F4il1Cz/dpUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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