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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9d5318be24fdbf9eeda4f8ef55c1e840a26cf52560de1c9021f708c23b35bd' 
  AND token = 'GFFuFAvOwAHFpu9phSM51Jqld4uEpIr3Pn87LTYSatM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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