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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daae8f3a24263494ceb055ae215b2d25f82b76df529a60bdf34c8704b0d5973c' 
  AND token = '4FzKtVkxIYHe2iw2V8yTLvYAn6ZalJodPD33NLaaV/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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