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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a7d4e9b48a347a2ed74e82eff84a618f8f99545d207627e84970f71528a199' 
  AND token = 'wGR+sF5QMqHQFRJDr5TgJkT2D5Jgfe+KvdpQzuWmI7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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