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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9ad579327751167cd096b1e9230d841bf3b410e13dc7e4f4c0fdc0de460364' 
  AND token = '3uK89JdJ70xhCb6+8tV/eLUljdV0w8rY/znqLLUu0Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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