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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da00fa24a873cdd791c7160f636ede79cea7082acd21b39aa241968c15110d3' 
  AND token = 'CDGkd+mq6R3pmuRg4vTfepyYAToVSghZ5X4x/oDKG38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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