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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cbb77ac9bd434d90f4580ebee913900760a7ab17bf35572b1faed7d01a000a' 
  AND token = '1xyQuatfK0SKvwITFLGf38DgNXoyDZ7OL1mCY5K06vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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