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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5dfe70dd473c5a705e96ce48fbf080b96f147905b0d52d3867d6deeb2f44ca' 
  AND token = '2V2QV0HFNH4TTIqhyVnkSKaCpyquRf4+SilHuwYzYzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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