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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6eac29a4601e2531857216bab8f41e6c8da9b0ba3223c6db0a199d3adb8124' 
  AND token = 'k9rwzvX5lzXY+IUXpXbBIxvBBlP+O0iCaWxjtv54plg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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