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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af21a060c251a33d373ce933bac9898e8507d79e8ab71ac8609c0b4c2e1f94c' 
  AND token = 'iilncn35VuhCsTu/PDzxutN8HeSmsDfE5EJsBmF6bUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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