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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5daa3ce5bf0b4d3fc03461cd89ec87922272364df73237f3edded5a2d9a5c9a3' 
  AND token = 'KFhV1X46GvhhDTV6QMtw5J7pq2wyLPahrNl5VCUQMso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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