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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3a61587d5d3e7e6209a24786828428a82dfeb360a53ea31c22ca88049b69b2' 
  AND token = 'a7K+tk05BQHU9JvQWUUNH5LQjG7Phndgxvgj7o+tM3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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