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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb94a991809ff583c9f48156206d130a9a64ed8112e146c6ebb37744af23a2af' 
  AND token = '1V4AH+vUve+7I/YqfU6j2LyFakhIm3bBf79NEx6K1eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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