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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9262d9258aa094593560aa220be4d6ce841c66713289fc6ec6a6230e9feb261b' 
  AND token = 'ZwfNmliX9JAQ3zAZnGhKXa9J9lNfaqVnj4toaeLp/+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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