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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ce516d876c51f833ed24ae0276c1493800e3ceb097718e3dcfb188b85186fc' 
  AND token = 'w4zd2AlTKtSTWB/WUWf0OQy0nu/3p/vnxQmm1CiWkeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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