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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd103cec661651cf25dceeeb74d9f43bef0a730a4621c501f28311938c65fed4f' 
  AND token = 'RWsuhYTK6KY9QGB0AH/U1M4ZcLg51OPtC0Ae7q9sFOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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