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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f101a44411bc280d7cc5c2067ad977909278341ac5fd30aaa0ba84587f3f35' 
  AND token = 'Q/bxaiOiSrwmce1VX4n7np5JbaSFW/rp5Y0rzRYHKCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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