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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08929b60d51446f34d46ef7c4eadf8c09eb5b79b4c8f1a1bac7b9dab42ff6105' 
  AND token = 'Q+E02nW31Ql999e3aMl+AJZ8EPu7lNGifixSxQ8pBA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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