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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd1f3b80b2862c1c3395437318610f0b55f3f430d6a9c76eff426ce56a774e2' 
  AND token = 'Syi0i440p6fH3IwPpTwbkr5d6uPwQiqluPKy1UVO4fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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