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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4339b59716db0f6800f567f639f81f3986aad7d23a8fd8845abcb2e5debda8' 
  AND token = 'CM/oDiCwS6LzB5SHeVf5pYc8rpt0OIcYBHSmhNnaPho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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