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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc1b5a76dffc39dc0e22bd47d47983ecf808154401495cdcfc9a783f87db4bd' 
  AND token = 'nYJv/lfZo0W5/be12kLVxD4kd2NQ7i5+KCLxyULzIu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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