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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d0d6f8305b6f603737c016fe7140597488d04aff0ae5d88b4d539b49b6b79b' 
  AND token = '5c9x9rBvS2VZnH1tfAK5Fii7BDp39j67bUQ84aCTm50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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