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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6297ca629a3305b107c911dccc80290fcae640cf6d5615e15a45e17a61f8b80b' 
  AND token = 'y1YVq7yjtHhT0oLS6Fm1v97x5usY6FXbpch5i+fBs8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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