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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2899e24cc8cd26a1c9fa33d65030046a2f79b53ff772d349350c091bf75ab8' 
  AND token = 'kJwono9XUJSPkCd3icLmaZQctfIlC7VdNEox8Y/ZsOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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