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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651f76ea7ace2128374867cd673e0c08bc0d9d0d0dbc0c5263997056774eefd8' 
  AND token = 'kaUM3/6OvzAi4hfZOxKQEBLF1Z7S4QotnmAN9H3qRwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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