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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5e5972e43584687a42198d9080debcd36ffb64eed3c78eac1961721e19ee8c' 
  AND token = 'xHboVPoM9Ny3MddQREGiIJByuaPA/9GsoaBLTmFJWTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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