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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfdf689c737d79f3d36f41f581fd14b42a579b717e6a480e1cb94027a0d2da7' 
  AND token = 'xrnAijvgeOKtyi6nDkfRcSO3UasIaxaKcnADNHu+5kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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