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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcab6e54c14d6c85a5b0e647334d6f7370a359971e343b3a486466499028b442' 
  AND token = '37B7XgOYBtUOtFWJqNqmLd/7KRM0qSPTdQOS8mgaO/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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