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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d79bbe15332b639ddb895e89251243f2e4f0918152f73ec81d2739a69c3e3c1' 
  AND token = 'GYcvb/7nJN/xhlYhaq36pcZMfrVb/uI8LCJU8eJJejo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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