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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a666e26c90f25e98051ecdfbd5c4648676b273c43bb6f76d1438f22c8aeb29' 
  AND token = 'WyDV2HWGC2utc7e6E5viKH5bfvBq9ZjT5OiMp0y+iVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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