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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98fab9972584cd4e591901bb4fe9547ed0bfce80100dea0c29c6d80db85c6fd' 
  AND token = 'iNCtQqclGFxEHb7r9f2hJGlinlWvGyw253UppD5/WNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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