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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ac4927b83c059cd7b42a0b2b4b9f6b1e8b2e514fb700ae8b98bef1c222d681' 
  AND token = 'b6JZPR+/Wh2/yeY6ZpzHCHZlpzgrIf5mSiB76n1nUeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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