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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787805009490a32e3743bf7f1eb911ef922d06b1fb415676ca2765b494482a41' 
  AND token = 'AhINFWC6crVBcp+sSFx8//S8PABWHj9bhlXkef/Dqq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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