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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e20cd0c73bc8e8de5dae4689cdc232ec01bb9742699ac3a529a842bcba4bfb' 
  AND token = '/0oRg3T+iEynxrHA45aAms15iWx//n1JqA9PTuXfUyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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