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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4847eceaceb76ea6fe44abdc94380e8bbbf56dd14a8b31ef65f0eb67c9bc9aee' 
  AND token = '5/N3Zxfo8kYbg5we5a/Hc7ntBF0QW1G90OYbRzd7Cno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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