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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b4a3bf1034dfdb1c0ef828a5b1bd5bab919fa56d2bc252b8a645e99d23f6ea' 
  AND token = 'cuSIhXG0UuPKNoFLJPmkU8tC8rRLwcH8EYVUJ2V0438=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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