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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61d7d511c48e28a710f6e66ae9fbb77c6d7d115c4b30b6554a45ab62c355604' 
  AND token = '9dUx1Y3xGcUMZj1EnHFa3y/1ao1vxdIwIQgbkDLnvO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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