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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab39e50555993d7676a619fee1d0142a217ba755c7d083c1cf1a04ac06db65b' 
  AND token = 'LZa5RTXHIJPp/HY4NA8C2aR49Uov5hWurtigGeYBCB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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