Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3effcf14662b8a88daf9645eb1b00ea5f6389ad202e2da2525e5da9c3ede9780' 
  AND token = 'oS1jTWWt3+2Z1t4YRKPUPErP8XzuhRMgviXrM7Kk7bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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