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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1817642c35b24cf3357d0acacd6a7ba03dbc90e3568d5c3a14cbed756c0166e' 
  AND token = 'sApoNLD5RK6HyOB72Gahycngiw/lPLV7E4wo9W075n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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